Umbrella frame



FIG. 1 is a perspective view of an umbrella frame showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof in fully upward extended positionwith the rest of an umbrella frame.

In FIG. 8, the broken line showing of other an umbrella frame depictsenvironmental subject matter only and forms no part of the claimeddesign.

The ornamental design for an umbrella frame, as shown and described.